There are a few reasons why your Wishlist could not be displaying.

Do you have an active Goodshuffle Pro account and the Website Wishlist activated? (If payments default on either, the integration will fail)

https://help.goodshuffle.com/en/articles/4789063-how-do-i-upgrade-to-the-latest-website-wishlist-integration-version

Is the required code placed correctly in the header and footer of the website?

Where and how this is done will depend on what website service you’re using (e.g. Squarespace, Wordpress).

Is your website version up to date?

Have you set the attributes for the inventory you’d like to pull?

Incorrect: <gspro-item-list></gspro-item-list>

Correct: <gspro-item-list category="furniture-rentals"></gspro-item-list>